Prevention and treatment of hemorrhagic disease of crucian carp

Crucian carp bleeding disease is a common disease of fish in high temperature season. In recent years, the incidence of Crucian carp bleeding disease has begun to rise, especially viral bleeding disease, which is more serious, fierce, high incidence and high mortality. Sometimes a pool of Crucian carp can die. Prevention and control of Crucian carp bleeding disease has become a key task of aquaculture. Let's take a look at the prevention and control methods of Crucian carp bleeding disease.

symptoms occurred

The high incidence period of Crucian carp hemorrhage was from May to September every year, and gradually threatened other cultured fish in the pond, resulting in a large number of dead fish. Crucian carp disease early, fish body on both sides, orbit, operculum, fins and other places mild congestion. Severe condition when the body surface and fins serious congestion, blood around the orbit, some fish eyeball protrusion, abdominal yellow ascites or red turbid ascites, intestinal wall congestion, intestinal inflation without food, more mucus. gill congestion or severe anemia, etc.

causative factor

There is much silt at the bottom of the pond, and a large amount of toxic substances are deposited. At the same time, the silt also provides a place for the pathogen of explosive hemorrhagic disease (Aeromonas hydrophila, Aeromonas sobria, Yersinia ruckeri) to breed in large quantities. The lack of oxygen in the water, the deterioration of the water environment. Unusual weather and temperature changes lead to stress responses in fish that reduce resistance.

treatment

1. External use: "Mujunxiao" 150 ml/mu * rice +"Benzalkonium bromide" 30 ml/mu * rice.

2. Oral administration: 200g/1000kg fish weight +300g/40kg feed mixed with bait, once a day for 5 days.

preventive measures

1, there are insect diseases to kill insects first,"Beichongjing" 40 ml/mu * rice, and grass carp and other fish mixed culture can be mixed with broken wheat mixed with "Dake bacteria" whole pool sprinkling feeding and pellet feed mixed with "Dake bacteria"+"stress Ning 3 type" fixed-point feeding combination.

2, if there is a problem with water quality must be improved before medication, water quality problems will lead to repeated bleeding, such as high nitrite can use "clean water antidote" 500 ml/mu * rice or "clean water" 200 g/mu rice.

3, during the treatment of fish disease or within a week after cure "three prohibitions": a ban on pulling nets, two prohibitions on large amounts of water, three prohibitions on the application of ammonium bicarbonate and other nitrogen fertilizers.